CN111971866B - Circuit arrangement, voltage source converter station and high-voltage direct-current transmission system - Google Patents
Circuit arrangement, voltage source converter station and high-voltage direct-current transmission system Download PDFInfo
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- CN111971866B CN111971866B CN201880091714.4A CN201880091714A CN111971866B CN 111971866 B CN111971866 B CN 111971866B CN 201880091714 A CN201880091714 A CN 201880091714A CN 111971866 B CN111971866 B CN 111971866B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 45
- 238000004804 winding Methods 0.000 claims abstract description 99
- 230000007935 neutral effect Effects 0.000 claims abstract description 85
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000000670 limiting effect Effects 0.000 claims description 8
- 230000002829 reductive effect Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
A circuit arrangement for attenuating an instantaneous current flow between a first point and a second point on a neutral line of a High Voltage Direct Current (HVDC) power transmission system is provided. The circuit arrangement may comprise: a first branch including a first winding and a resistive element connected in series; and a second branch including a second winding and a switching element connected in series. The first branch and the second branch may be connected in parallel between the first point and the second point. The first winding and the second winding may form part of separate inductors or be coupled to each other and form part of the same transformer. The inductance of the first winding may be less than the inductance of the second winding. Voltage Source Converter (VSC) stations and HVDC power transmission systems are also provided, as well as methods for modifying/upgrading HVDC power transmission systems and methods for operating circuit arrangements during converter bus faults.
Description
Technical Field
The present disclosure relates to the field of High Voltage Direct Current (HVDC) power transmission systems comprising one or more Voltage Source Converters (VSCs). In particular, the present disclosure relates to the handling of fault currents on Direct Current (DC) neutral lines of HVDC power transmission systems.
Background
Multi-terminal VSC DC grid configurations are emerging as VSCs prove more sophisticated in terms of control and performance. In a DC grid operation scenario, it may be necessary that the current is within the rated capacity of a Hybrid HVDC Breaker (HHB) when open, for example. As a result, such a DC grid may be equipped with a Current Limiting Reactor (CLR) connected in series with HHB on the DC lines and also on the DC neutral line. One or more CLRs may, for example, limit the fault current to below the rated capacity of the corresponding HHB during, for example, a fault current interruption.
For example, due to a single phase fault occurring at an Alternating Current (AC) converter bus, the duration of the instantaneous current during such fault current interruption may be long enough to impose additional stress on the diodes in the lower valve arm of, for example, a VSC. This increases the demands on the valve arms of the VSC both in terms of capacity and stress tolerances. Additional cooling devices may also be required, increasing cost and floor space.
Accordingly, in view of the above, there is a need for an improved apparatus for fault current handling.
Disclosure of Invention
The present disclosure seeks to at least partially meet the above needs. To achieve this, a circuit arrangement for attenuating the flow of transient current, a VSC station, an HVDC power transmission system, a method of modifying an HVDC power transmission system and a method of operating a circuit arrangement as defined in the independent claims are provided. Further embodiments are provided in the dependent claims.
According to a first aspect of the present disclosure, a (neutral) circuit arrangement is provided. The neutral circuit arrangement may be used for attenuating an instantaneous current flow between a first point and a second point on a DC neutral line of the HVDC power transmission system. The neutral circuit arrangement may comprise: a first branch including a first winding and a resistive element connected in series. The neutral circuit arrangement may comprise: a second branch including a second winding and a switching element connected in series. The first branch and the second branch may be connected in parallel between the first point and the second point. The inductance of the first winding may be less than the inductance of the second winding.
During fault current occurrence, the effective circuit resistance may be increased and the effective circuit inductance may be reduced. This may increase the decay rate of the instantaneous current in the lower valve arm of, for example, a VSC, so that the instantaneous current may decay more quickly. During normal operation, for example, when there is no current fault, operation may remain unaffected.
During normal operation, the switching element may be closed and the current may take a path in the neutral circuit arrangement via the second branch and the second winding, as the first branch comprising the resistive element may provide a higher impedance for the DC current. In other words, during normal operating conditions, the current flow between the first point and the second point may remain unchanged on the dc neutral line.
During, for example, a converter bus fault, such as, for example, an alternating current, AC, converter bus fault, the second branch may provide a higher impedance than the first branch because the inductance of the second winding is higher than the inductance of the first winding. Due to the lower inductance of the first winding, a decrease in current through the second branch may result, while the current through the parallel first branch starts to increase.
The switching element may be turned off when the current through the second winding decreases below the interrupting capacity of the switching element. Opening the switching element may fully rectify the transient current to the first branch and the first winding. The neutral circuit arrangement can see an increased effective resistance and a reduced effective inductance in the circuit. This may reduce the current decay time. The (fault) current through the lower valve arm of e.g. a VSC can decay more quickly.
In some embodiments, the neutral circuit arrangement may comprise a third winding connected to the first point. The third winding may for example form a connection between the VSC station and the first point if the neutral circuit arrangement is to be connected to for example the VSC station.
In some embodiments, the second winding and the third winding may form part of the same Current Limiting Reactor (CLR). For example, a portion of the total winding of the CLR may form a third winding and the remaining portion of the total winding of the CLR may form a second winding. The point at which the total winding of the CLR is split into the third winding and the second winding may be, for example, a first point.
In some embodiments, the sum of the inductances of the second winding and the third winding may be equal to the (total) inductance of the CLR.
In some embodiments, the first winding and the second winding may form part of a transformer. In other words, the first winding and the second winding may be magnetically (and reciprocally) coupled. During a converter bus fault, the impedance of the second branch may increase due to a reverse voltage generated from the coupled first and second windings, which is opposite to the current flow. Similarly, in the first branch, the current assist nature of the coupling windings of the transformer may help increase current flow.
In some embodiments, the switching element may be one of a High Speed Switch (HSS) and a Neutral Bus Switch (NBS).
In some embodiments, the first branch may be arranged such that the resistive element is located between the first winding and the second point.
In some embodiments, the second branch may be arranged such that the switching element is located between the second winding and the second point.
According to a second aspect of the present disclosure, a VSC station is provided. The VSC station may comprise neutral circuit means according to the first aspect.
According to a third aspect of the present disclosure, an HVDC power transmission system is provided. The HVDC power transmission system may comprise at least a DC neutral line. The HVDC power transmission system may comprise a VSC station according to the second aspect, or the HVDC power transmission may comprise a VSC station and neutral circuit arrangement according to the first aspect. The neutral circuit arrangement may connect the VSC station to the DC neutral line. When the VSC station is connected to the DC neutral line, current on the DC neutral line may flow at least partially between the first point and the second point of the device. In this context, when referring to a VSC station and a neutral circuit arrangement, it is also envisaged that the neutral circuit arrangement may form an integral part of the VSC station.
In some embodiments, the HVDC power transmission system may further comprise: the second VSC station (which may be a VSC station according to the second aspect) or the HVDC transmission system may comprise the second VSC station and a second neutral circuit arrangement (which may be a neutral circuit arrangement according to the first aspect). The second neutral circuit arrangement may connect the second VSC station to the DC neutral line. When the second VSC is connected to the DC neutral line, current on the DC neutral line may flow at least partially between the first point and the second point of the second device.
In some embodiments, the HVDC power transmission system may be arranged in an asymmetric monopolar configuration.
In some embodiments, in the VSC station according to the second aspect, or in the HVDC power transmission system according to the third aspect, the VSC station may comprise at least one half-bridge modular multilevel converter (HB-MMC).
According to a fourth aspect of the present disclosure, a method of modifying an HVDC power transmission system is provided. HVDC power transmission systems may comprise a VSC station, a DC neutral line and an existing CLR, which may for example connect the VSC station to the DC neutral line. The method may include: there is provided a neutral circuit arrangement according to the first aspect. The second winding of the neutral circuit arrangement may be or form part of an existing CLR.
In some embodiments, the HVDC power transmission network may further comprise an existing switching element connected in series with an existing CLR. The existing switching element may form part of (or may be) a switching element of a neutral circuit arrangement.
According to a fifth aspect, there is provided a method of operating a neutral circuit arrangement, such as the neutral circuit arrangement according to the first aspect, or as comprised in a VSC station according to the second aspect, or as comprised in an HVDC power transmission system according to the third aspect, during A (AC) converter bus failure. The method may include: it is determined whether the current through the second branch (of the neutral circuit arrangement) is within the current interrupt capacity of the switching arrangement. The method may include opening the switching element based on determining that the current through the second branch is within a current interrupt capacity of the switching element. The effect of the method may be as described earlier herein with reference to the neutral circuit arrangement according to the first aspect.
The present disclosure relates to all possible combinations of features recited in the claims. The objects and features described in accordance with the first aspect may be combined with or replaced by the objects and features described in accordance with the second and/or third, fourth and/or fifth aspects, and vice versa.
Further objects and advantages of the various embodiments of the present disclosure will be described below by means of example embodiments.
Drawings
Example embodiments will be described below with reference to the accompanying drawings, in which:
fig. 1 schematically illustrates an HVDC power transmission system;
fig. 2 schematically illustrates an embodiment of an HVDC power transmission system comprising neutral circuit arrangement according to the present disclosure; figures 3a and 3b schematically illustrate various embodiments of a neutral circuit arrangement according to the present disclosure; and
fig. 4 schematically illustrates an embodiment of a VSC station comprising neutral circuit arrangements according to the present disclosure.
In the drawings, like reference numerals will be used for like elements unless otherwise stated. Unless specifically stated to the contrary, the drawings show only the elements necessary to illustrate the example embodiments, and other elements may be omitted or suggested for clarity. As illustrated in the figures, the dimensions of the elements and regions may be exaggerated for illustrative purposes and, thus, provided to illustrate the general structure of the embodiments.
Detailed Description
Fig. 1 illustrates a (conventional) HVDC power transmission system 100. The system 100 is arranged in an asymmetric monopolar configuration and includes a first VSC station 110 and a second VSC station 112. One or both of the VSC stations 110 and 112 may, for example, include one or more Modular Multilevel Converters (MMCs). One or more of the MMCs may be, for example, a half-bridge MMC (HB-MMC).
The first VSC station 110 and the second VSC station 112 are connected via a DC link. The DC link includes a DC pole line 120 and a DC neutral line 122. The first VSC station 110 is connected to the DC lines 120 via Hybrid HVDC Breakers (HHB) 130 and Current Limiting Reactors (CLR) 140. The first VSC station 110 is connected to the DC neutral line 122 via the CLR 150 and the switching element 160. The second VSC station 112 is connected to the DC lines 120 via HHB 132 and CLR 142. The second VSC station 112 is connected to the DC neutral line 122 via the CLR 152 and the switching element 162. The DC neutral line 122 has a ground impedance 170.
For DC grid applications, the inductance of CLRs 140, 142, 150 and 152 may be, for example, large enough to reduce the fault current peaks below the rating of the DC breaker. The transient decay time for current in, for example, the lower valve arm, for example, of the VSC 110 may be longer during, for example, a single phase converter bus fault. The time for the current at the Point of Common Coupling (PCC) to reach zero may also be longer.
Referring to fig. 2 and 3, a HVDC power transmission system and neutral circuit arrangement according to the present disclosure will be described below.
Fig. 2 schematically illustrates an embodiment of an HVDC power transmission system 200. The system 200 is identical to the system 100 described above with reference to fig. 1, except that the CLR 150 and the switching element 160 have been replaced/modified by the neutral circuit arrangement 280 and except that the CLR 152 and the switching element 162 have been replaced/modified by the second neutral circuit arrangement 282.
It is also contemplated that HVDC power transmission system 200 may include more than two VSC stations, each connected to DC lines 220 and DC neutral lines 222.
Fig. 3a and 3b schematically illustrate embodiments of neutral circuit arrangements 300 and 301. Neutral circuit arrangements 300 and 301 may, for example, correspond to neutral circuit arrangement 280 or 282 in system 200 as illustrated in fig. 2.
The device 300 as illustrated in fig. 3a comprises a first branch 310 and a second branch 312. The first branch 310 may include a first winding 320 and a resistive element 330. The first winding 320 and the resistive element 330 may be connected in series. The second branch 312 may include a second winding 322 and a switching element 340. The second winding 322 and the switching element 340 may be connected in series. The first branch 310 and the second branch 312 may be connected in parallel between a first point 350 and a second point 352.
The first winding 320 and the second winding 322 may be disposed such that the first winding 320 and the second winding 322 are coupled to each other and form a part of the transformer M. The polarity of the transformer M is not indicated in fig. 3 a. If "point specification" is used, it is envisaged that the polarity is such that in fig. 3a, for example, a point will be inserted to the left of each of the first winding 320 and the second winding 322.
The switching element 340 may be, for example, a high-speed switch (HSS) or a Neutral Bus Switch (NBS). It is also contemplated that other suitable switching elements may be used.
The neutral circuit arrangement 300 also includes (or may include) a third winding 324. The third winding 324 may be connected to a first point 350. The apparatus 300 may be connected at one end to a VSC station (not shown), for example via a third winding 324.
The DC neutral line may be connected to the neutral circuit arrangement 300, for example, at the second point 352, and the VSC station may be connected to the neutral circuit arrangement 300, for example, at the left end of the third winding 324.
As previously described herein, the third winding 324 and the second winding 322 may be individual components (i.e., individual windings that are not part of the same inductor). It is also contemplated that the third winding 324 and the second winding 322 may form part of the same inductor (e.g., CLR). In this case, the point at which the total winding of the CLR is split into the third winding 324 and the second winding 322 may then be the first point 350.
The inductance of the first winding 320 may be represented as L 1 The inductance of the second winding 322 may be represented as L 2 And the inductance of the third winding 324 may be represented as L 3 . If the third winding 324 and the second winding 322 form part of the same CLR, then the CLR is denoted as L CLR May be such that L CLR ＝L 2 +L 3 . It is also contemplated that the third winding 324 may be optional and, for example, the second winding 322 is the entire CLR, such that L CLR ＝L 2 And L is 3 ＝0。
The inductances of the first winding 320 and the second winding 322 may be selected such that L 1 ＜L 2 。
During normal operation of the VSC connected to the DC neutral line via the neutral circuit arrangement 300, the first branch 310 may present a higher impedance to steady-state current than the second branch 312 due to the resistive element 330. If the switching element 340 is closed, current may pass through the second branch 312 and the presence of the neutral circuit arrangement 300 may leave the DC current flow unaffected.
The higher inductance of the second winding 322 may introduce a higher impedance for the current through the second leg 312 during, for example, a single-phase AC converter bus fault. Current may then begin to flow through the first branch 310 (at the first branch 310, the impedance is lower due to the lower inductance of the first winding 320). Eventually, sufficient current may be diverted through the first branch 310 to bring the current in the second branch 312 within the current interrupt capability of the switching element 340. The switching element 340 may then be opened, thereby completely rectifying the current flow through the first branch 310.
The device 300 can see an increased effective resistance (R) and a decreased effective inductance (L). The increased effective resistance and reduced effective inductance may increase the decay rate and reduce the decay time. The reduced effective inductance and increased effective resistance in the instantaneous current path may be utilized to reduce the time constant of the circuit. This may for example present an improvement in terms of a shorter instantaneous decay time for the current in e.g. the lower valve arm of the converter and/or in terms of a shorter time for the current at the Point of Common Coupling (PCC) to reach zero when compared to the (conventional) HVDC power transmission system described with reference to fig. 1.
The apparatus 301 illustrated in fig. 3b is similar to the apparatus 300 illustrated in fig. 3a, except that the first winding 320 and the second winding 322 do not form part of a transformer. Instead, the first winding 320 and the second winding 322 are individual windings/inductors that are not coupled to each other.
Referring to fig. 4, an embodiment of a VSC station according to the present disclosure will be described below.
Fig. 4 schematically illustrates a VSC station 400. The VSC station 400 includes at least one VSC 410 and neutral circuit means 430. The neutral circuit arrangement 430 may be a neutral circuit arrangement described herein (e.g. the neutral circuit arrangement 300 as illustrated in fig. 3a or the neutral circuit arrangement 301 as illustrated in fig. 3 b) and may be arranged to connect the at least one VSC 410 and VSC station 400 to the DC neutral line 420. The VSC station 400 may also be connected to the AC grid 440, for example, by using at least one transformer 450. The VSC station 400 may comprise more than one VSC 410 and the plurality of VSCs 410 may be connected in series, for example. The VSC station 400 may for example form part of an HVDC power transmission system, such as for example part of the HVDC power transmission system 200 described herein with reference to fig. 2.
The present disclosure also provides methods related to using neutral circuit arrangements according to the present disclosure. In an embodiment of one such method, an HVDC power transmission system, such as the system 100 described herein with reference to fig. 1, may be upgraded/modified by providing a neutral circuit arrangement according to the present disclosure, such as the neutral circuit arrangement 300 described with reference to fig. 3a or the neutral circuit arrangement 301 described with reference to fig. 3 b. If the HVDC power transmission system already comprises an existing CLR on the DC neutral line, part or all of the existing CLR may be used to form the second winding (and optionally the third winding) of the neutral circuit arrangement. By doing so, it is possible to use existing CLRs already existing. For example, an existing CLR that is already present can be split into two windings at a first point. The partial winding of the CLR connected between the VSC station and the first point may be a third winding and the partial winding of the CLR connected between the first point and the DC neutral line may be a second winding. The neutral circuit arrangement of the present disclosure may then be completed by providing a first winding, a resistive element and a disconnect element as described herein.
If the HVDC power transmission system to be upgraded/modified already comprises an existing switching element, such as an HSS/NBS connected in series with an existing CLR already present, this existing switching element may be used as a switching element in the second branch of the neutral circuit arrangement.
The present disclosure also provides a method of operating a neutral circuit arrangement according to the present disclosure during a converter bus fault. As described herein, the neutral circuit arrangement may be comprised in the VSC station and/or in the HVDC power transmission system and connected between the VSC station and the DC neutral line of the HVDC power transmission system. When a fault has been detected (this process may be included as an optional first step of the method), the method may include the steps of: wherein it is determined whether the current through the second branch (between the first point and the second point) is lower than (or within) the current interruption capability/capacity of the switching element. If it is determined that the current in/through the second branch is sufficiently low (e.g. below or within the current interruption capability/capacity of the switching element), the switching element may be turned off to completely divert (rectify) the (fault) current through the first branch. As previously described herein, the increased effective resistance and reduced effective inductance of the neutral circuit arrangement may present benefits with respect to reducing the decay time of the valve arm current and the time for the PCC current to reach zero. The reduction of the current transients may reduce the stress on a valve in, for example, a VSC station. This may result in reduced stress on the diode and on, for example, the associated heat sink and cooling device. Power outages in the dc grid may also be reduced due to the reduced stress requirements to be handled.
Although features and elements are described above in the context of a particular combination, each feature or element can be used alone without the other features and elements or in various combinations with or without other features and elements.
Additionally, variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims (17)
1. A circuit arrangement (300, 301) for attenuating an instantaneous current flow between a first point (350) and a second point (352) on a direct current, DC, neutral line of a high voltage direct current, HVDC, power transmission system, the circuit arrangement comprising:
a first branch (310) comprising a first winding (320) and a resistive element (330) connected in series, an
A second branch (312) comprising a second winding (322) and a switching element (340) connected in series,
wherein the first branch (310) and the second branch (312) are connected in parallel between the first point (350) and the second point (352),
wherein the inductance of the first winding (320) is smaller than the inductance of the second winding (322), and
wherein, due to the resistive element, the first branch presents a higher impedance to steady state current than the second branch during normal operation, such that during the normal operation the switching element is closed and current takes a path in the circuit arrangement via the second branch and the second winding.
2. The circuit arrangement of claim 1, comprising a third winding connected to the first point and connected in series with the first and second branches connected in parallel.
3. The circuit arrangement of claim 2, wherein the second winding and the third winding form part of the same current limiting reactor CLR.
4. A circuit arrangement according to claim 3, wherein the sum of the inductance of the second winding and the inductance of the third winding is equal to the inductance of the current limiting reactor CLR.
5. The circuit arrangement of any of claims 1 to 4, wherein the first winding and the second winding form part of a transformer.
6. The circuit arrangement according to any of claims 1 to 4, wherein the switching element is one of a high-speed switch HSS and a neutral bus switch NBS.
7. A circuit arrangement according to any one of claims 1 to 4, wherein the first branch is arranged such that the resistive element is located between the first winding and the second point.
8. A circuit arrangement according to any one of claims 1 to 4, wherein the second branch is arranged such that the switching element is located between the second winding and the second point.
9. A voltage source converter VSC station (400) comprising the circuit arrangement (430) according to any one of claims 1 to 8.
10. The voltage source converter VSC station (400) of claim 9, further comprising at least one half-bridge modular multilevel converter HB-MMC.
11. A high voltage direct current, HVDC, power transmission system (200) comprising at least a DC neutral line (222), the high voltage direct current, HVDC, power transmission system further comprising:
a voltage source converter VSC station according to claim 9 or 10; or alternatively
A voltage source converter, VSC, station (210) and a circuit arrangement (280) according to any one of claims 1 to 8;
wherein the circuit arrangement (280) connects the voltage source converter VSC station (210) to the DC neutral line (222).
12. The high voltage direct current, HVDC, power transmission system according to claim 11, further comprising a second voltage source converter, VSC, station, which is a voltage source converter, VSC, station according to claim 9 or 10; or alternatively
A second voltage source converter VSC station and a second circuit arrangement, the second circuit arrangement being a circuit arrangement according to any one of claims 1 to 8;
wherein the second circuit arrangement connects the second voltage source converter VSC station to the DC neutral line.
13. A HVDC transmission system in accordance with claim 11 or 12, wherein said HVDC transmission system is arranged in an asymmetric monopolar configuration.
14. A high voltage direct current HVDC power transmission system in accordance with claim 11 or 12, wherein said voltage source converter VSC station comprises at least one half bridge modular multilevel converter HB-MMC.
15. A high voltage direct current, HVDC, power transmission system according to claim 11 or 12, further comprising an existing current limiting reactor, CLR, connecting the voltage source converter, VSC, station to the DC neutral line, wherein at least part of the existing current limiting reactor, CLR, forms the second winding of the circuit arrangement.
16. The HVDC transmission system according to claim 15, further comprising an existing switching element connected in series with said existing current limiting reactor CLR, wherein said existing switching element forms part of said switching element of said circuit arrangement.
17. A method of operating the circuit arrangement of any one of claims 1 to 8 during an alternating current, AC, converter bus fault, the method comprising:
determining whether the current through the second branch is within a current interrupt capacity of the switching element; and
the switching element is turned off based on determining that the current through the second branch is within the current interrupt capacity of the switching element.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2018/057277 WO2019179624A1 (en) | 2018-03-22 | 2018-03-22 | Neutral circuit arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111971866A CN111971866A (en) | 2020-11-20 |
| CN111971866B true CN111971866B (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880091714.4A Active CN111971866B (en) | 2018-03-22 | 2018-03-22 | Circuit arrangement, voltage source converter station and high-voltage direct-current transmission system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3769388B1 (en) |
| CN (1) | CN111971866B (en) |
| WO (1) | WO2019179624A1 (en) |
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| CN104126210A (en) * | 2011-12-23 | 2014-10-29 | 阿尔斯通技术有限公司 | Mechatronic circuit breaker device and associated tripping method and use thereof in interrupting a high direct current |
| CN105122408A (en) * | 2013-02-13 | 2015-12-02 | 阿尔斯通技术有限公司 | Circuit interruption device |
| WO2017186262A1 (en) * | 2016-04-25 | 2017-11-02 | Abb Schweiz Ag | Bidirectional commutation booster |
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2018
- 2018-03-22 EP EP18712888.9A patent/EP3769388B1/en active Active
- 2018-03-22 CN CN201880091714.4A patent/CN111971866B/en active Active
- 2018-03-22 WO PCT/EP2018/057277 patent/WO2019179624A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012100831A1 (en) * | 2011-01-27 | 2012-08-02 | Alstom Technology Ltd | Circuit breaker apparatus |
| CN104126210A (en) * | 2011-12-23 | 2014-10-29 | 阿尔斯通技术有限公司 | Mechatronic circuit breaker device and associated tripping method and use thereof in interrupting a high direct current |
| CN105122408A (en) * | 2013-02-13 | 2015-12-02 | 阿尔斯通技术有限公司 | Circuit interruption device |
| WO2017186262A1 (en) * | 2016-04-25 | 2017-11-02 | Abb Schweiz Ag | Bidirectional commutation booster |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111971866A (en) | 2020-11-20 |
| WO2019179624A1 (en) | 2019-09-26 |
| EP3769388A1 (en) | 2021-01-27 |
| EP3769388B1 (en) | 2022-10-12 |
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